To unlock this achivement, complete all three major faction quest lines. This includes the following quests:
The Blue Chamber Collective
The Heroic Kingdom of Levant
The Holy Mission of Elatt
Note: You will need to create three different characters to complete this achievement. Each character can pursue only one faction quest line. In other words, once you choose a specific faction with one character, such as The Blue Chamber Collective, you are excluded from the other two permanently with that character.